How many letters does the top answer for “a strong post (as on a wharf or quay or ship for attaching mooring lines)” have?

The most common answer is bitt (4 letters).

Crossword clue: a strong post (as on a wharf or quay or ship for attaching mooring lines)

2 answers found in Letterora's clue database (Wikidata facts, Open Trivia DB, WordNet and Webster definitions — all licensed sources).

bitt 4 letters wn-def

a strong post (as on a wharf or quay or ship for attaching mooring lines)

bollard 7 letters wn-def

a strong post (as on a wharf or quay or ship for attaching mooring lines)